New limits on Early Dark Energy from the South Pole Telescope

Details New limits on Early Dark Energy from the South Pole Telescope New limits on Early Dark Energy from the South Pole Telescope

2011-10-24

arxiv.org/abs/1110.5328v2

ApJ 749 (2012) L9

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 3 figures. ApJL (updated to accepted version)

Scientific paper

We present new limits on early dark energy (EDE) from the cosmic microwave background (CMB) using data from the WMAP satellite on large angular scales and South Pole Telescope (SPT) on small angular scales. We find a strong upper limit on the EDE density of Omega_e < 0.018 at 95% confidence, a factor of three improvement over WMAP data alone. We show that adding lower-redshift probes of the expansion rate to the CMB data improves constraints on the dark energy equation of state, but not the EDE density. We also explain how the small-scale CMB temperature anisotropy constrains EDE.

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